Furnace won't stay on

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   Found a tiny wasp nest in the Furnace intake. Didn't seem big enough to cause a problem but I will have to test it again when I get a chance, hopefully that was it. Thanks for the help.

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PodDude Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Apr 2016 Online Status: Offline Posts: 51	Topic: Furnace won't stay on Posted: 04 Jun 2019 at 11:21am
	Found a tiny wasp nest in the Furnace intake. Didn't seem big enough to cause a problem but I will have to test it again when I get a chance, hopefully that was it. Thanks for the help.

offgrid Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290	Posted: 03 Jun 2019 at 5:46am
	If the blower is running your 12V is OK. When the furnace control board gets a call for heat from the tstat it turns on the blower first while it checks for proper airflow before igniting. If it doesn't sense the airflow within 30 seconds then it shuts down. There is a device called a sail switch that has a paddle sticking into the air stream that is supposed to close when the air blows across it. It could be that this is not activating. Here is the Suburban manual. There is a sequence of operation and a troubleshooting guide about halfway through. http://docs.renegaderv.com/Suburban/Furnaces/FURNACE_Service%20and%20Training%20Manual%2011-05-2015.pdf
	1994 Chinook Concourse 1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold

PodDude Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Apr 2016 Online Status: Offline Posts: 51	Posted: 02 Jun 2019 at 7:26pm
	Last trip, my furnace will kick on for say 30 seconds then turn off. Then I cycle through Off, Cool, Heat and same story. I had the heat set at 80F and the ambient temp was about 40F. I checked the fuse. Removing and re-inserting will kick it on, then it turns off again. Is this because my battery was low? I would think it wouldn't start in the first place if so. Thanks all!